What is the difference between the Grades tab and Campus Backpack in the Parent Portal?

What is the difference between the Grades tab and Campus Backpack in the Parent Portal?

The Grades tab displays the current grades of a selected student. The Reports tab provides a view of the report card in a generic format. The Campus Backpack area contains official progress reports and official report cards. The official high school report card includes transcripted GPA (weighted and unweighted) and total credits.